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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6fe8ef5922d7be6f5042b3508d8e38f4c55f1aa04ff3e993c50942637e0c94' 
  AND token = 'W8RqQTNUH0qN+AbRNyFremqkTGN0ymrdJcqGq20Laac=' 
  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"
    }
  }
}