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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf3fe30b91cc9d3716d731d92a277b3ecca50a125da0660c3d390ab0bfbdfe9' 
  AND token = 'ZszPQIXwJmCqNm57TJlVni/OTLoc0qx4WV7H/fh+viU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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