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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7a91515cda8f69aa0bbdaee52a49f426ff008a0d90991324011a3e358603c4' 
  AND token = 'NPkf+7CTwEAl7jjIjgbIPTwG5+hJrXDTLgfjyvTaSAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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