SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b19cea499677ca8073232c36cb2e52917aecd274b3441493c58c2809cf64e0e' 
  AND token = 'gXVsQYy+29gwzM7YOJZ18hxqH9rS6xPcK5i/ynhngbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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