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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e22689bff876110441e9307206bc71d4465956e57c1d4c5a947293cff02859' 
  AND token = 'MWX69fRokPbgjGY5bhfIjpO1L1lu+rRnpOlRiY4ZK0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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