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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e347b223c1d4e40c091d80b5987e230d6562d6ec66d1908acb89e2a0433e0dad' 
  AND token = 'Hd/651XWdm9FvRvHKS0mXXzYjqBHN95GwBFreTu1sVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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