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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c29480b2329348d34d118d61fccc42450d0238058a10f9a8a3151d1ce659a00' 
  AND token = '5ZOK5ISIeGAPaGSdQ1arUHME9g+gZ5TclOZk6YB4sV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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