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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265b590c642f73bc6417cfac1564fe4476f2cfdbf617cbceeaa83e857d2cc328' 
  AND token = '8X/LHdY4PoQVIM3N2wU/fK4R5n0YmdKIp5LgEjCksJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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