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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fefc30f92530b5391e25c2ead978de3400deeb32718ecd6a520558c16b5e701' 
  AND token = 'F55JmIKqDUQIcCgQu0ZqM4w7w7gBJcIBUTt5QHcXaRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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