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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7768605de044829c0dfc961442d1ac932afabd780ef0e6f5134875fe4005561' 
  AND token = 'Ex2hKh88X39FkwDUySZ/iI2ZU1yEPlH+Ck8tJSv+uKE=' 
  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"
    }
  }
}