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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518be3cc66983d04af883710d8ac446fb5b1e3eba9361b72d5282fd79904bc24' 
  AND token = 'KDhsutAHieXXg/kn2H77oxJi4xMlMHI+mIcbGQl+yxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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