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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4515b011b9cd254fc6c93c9f498ff66ae6506d1119947c28325db8d3326dc0ba' 
  AND token = 'PP3hRKQBT7Yu4luDtSNsDrOG0Ib8XnNgEd3iUGoovYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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