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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba8516ea47c33cc98a054e048e8e8314eae7549450908650a2ee71251f6155b' 
  AND token = '0rRUcv6MfH5y/UtzcMHhPOWhaWzu/lf9N0Gh2Bg7sn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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