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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a29ca88c74d30aefed1379c6d69b2ab6ab6aab1b5750c3b0743b252c216fb20' 
  AND token = 'KESQ96p3cQ2BAtmPPdtEC7IXMPtCgx78DTp+Y8CgCbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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