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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fef64decf85647a98b2905a5ab6ced142525f8b4fa82d746b5354031a43af6' 
  AND token = 'dwd6S5VKCg4r7D4QAkf57OrbgPre2Yp8qOSmFglX/m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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