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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec850795897d243b0332e7d834e744504bc780d5053e4c31de03004693620c72' 
  AND token = '/jGBxI/0LdrhiKGlxU1n9RQd7Z0upqtnkO4IIMx+k7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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