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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c92807d3c52f7d4cf12b4827d393bf3e49246b7868546cd1d2714871a4b206' 
  AND token = 'qUTGYA1LAAfhiqe2Q19/SQ9fhAsyElpXESkmQD7FoQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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