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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309162122adbd4905d6dfa6b395eb49d9d85203f6a6283e05a9ec7d877ed140a' 
  AND token = 'jxLRe4yqByZnI8CMuBoP6XFGSM4yVw76P4tZtkxJgeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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