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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27f91f2f25976f90f69243566240d220027b9f812b60e68d9c3e0d6364b0c1c' 
  AND token = 'tLrfZ+bXq/UOTFgQIYJuX9Q3cAg8Y/U17q6Ean8KA24=' 
  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"
    }
  }
}