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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda703ad777761d76d84c9623993cdfc478bcb9dffb5780a888fb8d90a309c28' 
  AND token = 'LY+ucA6LlfN2ssQRlzEo6sd/bKdPWOCnCaRTYVe+52E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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