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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3776e9b47a2d7d7c443e86be6fcbda6a12089db085227228f3c37ca8d3e650cf' 
  AND token = 'K4C6d1jG2Ih2oIBm7CWKB2hJigI1P4kRBDIzudBV930=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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