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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf363fe45fabffa8b8de8d59a067a159c968a2f8901f1c42db378a67761c01a5' 
  AND token = 'Gca1vjA4+UQpJi4IIqiVTnPJVTOG7chNy76vT/J3J3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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