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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f597c4b290e3a2930167dbe652e73e5a26349b7e29697f0a4688ec4c043f35' 
  AND token = 'B616fsbPW1iuzJNytFQKzn5339kTnWqhiJflJNqcc2M=' 
  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"
    }
  }
}