Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903229bc257b2660466803210fc27867b0d01d2b841d2ba9c7dba552d34cdf58' 
  AND token = 'ZtGdrh0cf5AUpmNxLp2W7+RUBbGy92+z9OOJX/cgf/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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