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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e8d2dd22e25146f1c3baac9855681f0e3a911fd2b2c4b1b6b987cfb16a06ce' 
  AND token = 'XJU9TrSFX8RrAxgezd3uKzuvt1d3WJRDSWspbhW0MmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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