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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b467e32e096bd4d21647e4fd9e3c2675f96d4a9450a274e5bfe3e88b04b01b' 
  AND token = 'ca9eOxOhNNXRLzbCffwOcwwdzhEZhDUGCq9HpY14AWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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