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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8489c7fe4db200492577d5af6946feb35c220c890a3da50fe912bef359050a7' 
  AND token = 'NMtn4kwFQry3VQ21km11f7l1AwUWNnQ9vuzuYrcu7Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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