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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09563c6a4e9d2a2951c454098492d65d23e930608949412bd09d56c729a43c2b' 
  AND token = 'REJ3QJngbKMPK9B9ZDnIDLdYEHT/XyLRI4TPtYb1w3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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