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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889ae0d64273005c6281caf9eb76e99a09a84f1f26d8e14d70f76dd28e81faa2' 
  AND token = 'P7RTlfpy6jxIfWL5YYGZSV7r0DrQMrJJBb2iPI9jxrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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