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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd8a934e3147c5379d2481e2323ee08ff05f20960672f473ee0eadd91e4bc8b' 
  AND token = '962fNX9sucqK6Z6sV7m0/d0SYSAkgy2lmoFTOVVVN9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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