SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432906c5846d14946acb177913b62db6393a8d0c2abdf0383fff154a4e22da5a' 
  AND token = 'eoKvWqbX7bilzsOSf2zmI+y0MaJ6QLw9g96GPvvLEUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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