SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422c857102dff4062c98ca6f8c4bf827e1d38a97043289c4abd4c7bc3525c011' 
  AND token = '0WYDig9MuG3kOHeCLIuQDqgYfZGHjD9KjLq+RC4Ib8A=' 
  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"
    }
  }
}