SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07f6b10cf2200d34b033c34671c4d163f70461b3c2df588dca5746948d931a2' 
  AND token = 'Ih8hwQpkKMtSH8Gjq4HBTwph6/KWZf0Hoiv3haIQZbw=' 
  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"
    }
  }
}