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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdd6f4bd0c3705ab093205ff7e5660af5b3e6f0c369ff0b76f6a80817113112' 
  AND token = '1j/5OKPgWZxTKidJNGzeA6/0EkFr8b6VsTRazW7pDuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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