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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691d2a341a550d85744e0ca64e62ca758269e2093c91960cd6d2ade47ec466da' 
  AND token = 'Iwa5UdUbzMbhTXKLP55vQLF+3DBRoVdV41Dl38xOzKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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