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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ce325fda888c2a2dd5df9454ec1c59941461f05f58a4bcd3648f157e7425fa' 
  AND token = 'oZfZ6ShGYOYPwEROWSjZJc8dEXGwpKQUeIChrAJxYEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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