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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99ee8fb68b34c742b0879b4ff1c03bcf65217a78167b1dd7b33a93c72ef1a55' 
  AND token = '+kklHTKMtQMk1eiT5OuAz8iaGbF4I5o/5k0gyYiqLBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}