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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da72546c7fe7e6529cb9e86ab7c338820e7a9773a52d70f646aa70712e29b0ed' 
  AND token = '7SB2nDB7KLFqZMKIeXYvl7XnwB5sW3xEpqwquqRv234=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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