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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f3466e8459c1551c8fbfa2a074af94330ad995046f0e09d08a43f6aa3773f7' 
  AND token = 'XyVX+A+9arJZqReS+vdhun83l01w2NfFo5f5GQhPDlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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