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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd349bb507e753c9a13bff92dd0bac98cbaf5d15cf4307842418ba405e0ea46ce' 
  AND token = 'Z2wl8oOVTWuQj7lJTHGDAy/bdQb9Y4/FOMwczQrLJ1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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