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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b86c4da5ac0cf26f361a9a14a36cfe2cf1d24b357cc8393462856e66be2d254' 
  AND token = 'l1TX4TI8uin8WOtjmIxVPz9SaYVkjLu73V4sqBfGk2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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