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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c356ac8de56f0cee224b48123fb2434ee319f3c1c2f488d4c674629b27faf52' 
  AND token = 'UZPaG9fsbR3Q4D0JjA7kD8Wkg6Qye/8ilZbtCLQCxPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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