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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73de3614979cfa205cb477b5dc4f4808e3ceaa30f24cf5ecc5a75d5bd9ba3f9a' 
  AND token = '/0ELeJ4GMl3xfc8pH9ukaD+MqWHtUKhWDO4vrILk8UA=' 
  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"
    }
  }
}