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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d253b4e69763a85379a8a57dae8417e20d15e2b6ddaa32d9b8447ff7f2b2ba' 
  AND token = 's79XZK3GIN6Cl84R/eGchhVhQzd1pmV4G/m/NrJr0Xk=' 
  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"
    }
  }
}