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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af4fb20331ddf0ddd918460848712d98e385f5bee48528fa892295e108542a2' 
  AND token = 'pYsb6fbqrngtJ9nZiAg+WdrGJDv6e0tP5Tb9jmwFTPk=' 
  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"
    }
  }
}