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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190be62a07bfeaeafbb305c0005e315a2608dbf63567d512a3a8ce51b5939379' 
  AND token = 'x+xJaxD/wXxfK1yWU4/v8WlwJTqFu0fkYgCwCE5EuHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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