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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '449ee1a8bf0adaabc3bdeca9c60a65e51cd67f6dfd3ae7de268096a188df3af8' 
  AND token = 'gT4vMfaM3SSF9tyfS6xErB8Ckb0dmeNSZT3tIos/7wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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