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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a1a9c3ee0f91fce31e661ce991575c6c68c555152f12c697f35a6fa37b0aff' 
  AND token = 'iGYDEvZHY2xYDqZSg5BC3IaDa/u4ebkZcnvJZPZTOYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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