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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3642a5a1cf002498f917bfc9f049f4b233557f319f0ba5db4dff2ce571467a7b' 
  AND token = 'ksfYkvaQgUKQSB+2xgMeyusxS25wyk95+WEv9iAFwqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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