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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c85ae15cf727cf6640495184f3395b5178aa8e6b4629f6ff66081eae88a70f' 
  AND token = '1Sis6qjh8y0r4RsSh7lNsb+fB7DQ1L0c1p45u1bCR7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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