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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca7a43d35d58878482e27be013dc0d39b12c783cae049cdf9efa8ea40e6f981' 
  AND token = 'MW8AtJyECG18A4Jn8o+DGn5xJ+2nmwC11jDnbB1UrJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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