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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4b3c0443cb4f7d4bacea99d57c9312ed1653b6bdc1adc98d080f3386c46953' 
  AND token = '9PoX96h/lWBX03Is/eClEHESxdSKf3pvz5F5zwaO10U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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