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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47df48dc2f53b1d32106369ba3370ac5e04341ce3046cf4e5a00e6169a47bd6d' 
  AND token = 'QGDFOjOGWiY4wp5Slkg8KtMrszLiDEym/xP+lC1alao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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